Method getCacheIndex

java/lib/src/main/java/io/github/ccxt/Exchange.java:4273–4277

(Object orderbook, Object deltas)

    }

    public Object getCacheIndex(Object orderbook, Object deltas)
    {
        // return the first index of the cache that can be applied to the orderbook or -1 if not possible.
        return Helpers.opNeg(1);
    }

    public Object arraysConcat(Object arraysOfArrays)
    {